function [phi] = angleEstSDB(din)
    beamSum  = din(1) + din(2);
    beamDiff = din(1) - din(2);
    deltaPhiDiv2 = real(beamDiff / beamSum * 1j);
    phiRad   = atan(deltaPhiDiv2) * 2;
    phi      = asin(phiRad/pi);
end
